Luvr
Post count: 289
I fixed the bug with editing posts – so that should work now.
As to uploading images, I'm not sure how to help you. I don't have that operating system to test, but have tested that browser in Mac and Windows and it works fine there.
Uploading an image starts with clicking the Insert / edit image button in the toolbar above.
After that, click the 
button to browse your files.
That's about as detailed as I can get!